/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshQueryFunctions.h
Compute the interpolated Vertex Color (A*Color1 + B*Color2 + C*Color3), where (A,B,C)=BarycentricCoords and the Colors are taken from the specified TriangleID in the Vertex Color layer of the TargetMesh.
static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * GetInterpolatedTriangleVertexColor ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, int32 TriangleID, FVector BarycentricCoords, [FLinearColor](API\Runtime\Core\Math\FLinearColor) DefaultColor, bool & bTriHasValidVertexColors, [FLinearColor](API\Runtime\Core\Math\FLinearColor) & InterpolatedColor )